VIM and neoplasm: AC-PDTXs retained the tumor epithelial component only at 1.5 months from the graft (Figure 2B), whereas these xenografts showed only stromal tissue at 3 and 6 months from the graft as evidenced by microscopic (H&E staining, Figure 2B) and immunohistochemistry (vimentin staining, Figure S1 in Supplementary Material) analyses.